CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 28, 2017	Sep. 30, 2017	Sep. 30, 2016
Successor
Cash flows from operating activities:
Net income (loss)		$ 748,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization		12,186,000
Non-cash reorganization items		0
Impairment of oil and gas properties		0
Abandonment and impairment of unproved properties		0
Well abandonment costs and dry hole expense		74,000
Stock-based compensation		10,595,000
Amortization of deferred financing costs and debt premium		0
Derivative loss		2,762,000
Derivative cash settlements		0
Other		7,000
Changes in current assets and liabilities:
Accounts receivable		(2,027,000)
Prepaid expenses and other assets		(80,000)
Accounts payable and accrued liabilities		(11,910,000)
Settlement of asset retirement obligations		(936,000)
Net cash (used in) provided by operating activities		11,419,000
Cash flows from investing activities:
Acquisition of oil and gas properties		(5,074,000)
Exploration and development of oil and gas properties		(42,355,000)
Payments of contractual obligation		0
(Increase) decrease in restricted cash		(12,000)
Additions to property and equipment - non oil and gas		(667,000)
Net cash used in investing activities		(48,108,000)
Cash flows from financing activities:
Proceeds from credit facility		0
Payments to credit facility		0
Proceeds from sale of common stock		0
Payment of employee tax withholdings in exchange for the return of common stock		(2,398,000)
Deferred financing costs		0
Net cash (used in) provided by financing activities		(2,398,000)
Net change in cash and cash equivalents		(39,087,000)
Cash and cash equivalents:
Beginning of period		70,183,000
End of period	$ 70,183,000	31,096,000
Supplemental cash flow disclosure:
Cash paid for interest		455,000
Cash paid for reorganization items		0
Changes in working capital related to drilling expenditures		9,325,000
Predecessor
Cash flows from operating activities:
Net income (loss)	2,660,000		$ (131,616,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	28,065,000		84,602,000
Non-cash reorganization items	(44,160,000)		0
Impairment of oil and gas properties	0		10,000,000
Abandonment and impairment of unproved properties	0		24,463,000
Well abandonment costs and dry hole expense	2,931,000		905,000
Stock-based compensation	2,116,000		7,249,000
Amortization of deferred financing costs and debt premium	374,000		2,705,000
Derivative loss	0		11,724,000
Derivative cash settlements	0		15,749,000
Other	18,000		127,000
Changes in current assets and liabilities:
Accounts receivable	(6,640,000)		29,442,000
Prepaid expenses and other assets	963,000		(1,047,000)
Accounts payable and accrued liabilities	(5,880,000)		(23,252,000)
Settlement of asset retirement obligations	(331,000)		(473,000)
Net cash (used in) provided by operating activities	(19,884,000)		30,578,000
Cash flows from investing activities:
Acquisition of oil and gas properties	(445,000)		(919,000)
Exploration and development of oil and gas properties	(5,123,000)		(47,491,000)
Payments of contractual obligation	0		(12,000,000)
(Increase) decrease in restricted cash	118,000		(7,707,000)
Additions to property and equipment - non oil and gas	(454,000)		(106,000)
Net cash used in investing activities	(5,904,000)		(68,223,000)
Cash flows from financing activities:
Proceeds from credit facility	0		209,000,000
Payments to credit facility	(191,667,000)		(58,667,000)
Proceeds from sale of common stock	207,500,000		0
Payment of employee tax withholdings in exchange for the return of common stock	(427,000)		(283,000)
Deferred financing costs	0		(316,000)
Net cash (used in) provided by financing activities	15,406,000		149,734,000
Net change in cash and cash equivalents	(10,382,000)		112,089,000
Cash and cash equivalents:
Beginning of period	80,565,000	$ 70,183,000	21,341,000
End of period	70,183,000		133,430,000
Supplemental cash flow disclosure:
Cash paid for interest	3,509,000		39,235,000
Cash paid for reorganization items	52,968,000		0
Changes in working capital related to drilling expenditures	$ 3,360,000		$ (27,952,000)